Friday, January 10, 2014
Simple Peak Indicator
A simple circuit, peak indicator of tops of musical signal. Each time where the level of signal exceeds the level + 4dB, turns on led D1. It is useful in each channel of console of sound, in final amplifiers or in that other application, to we needed. With the prices of circuit, the indicate begins with levels above + 4 dB (1.25V rms). For adaptation in different levels of signal, we can use a trimmer, before capacitor C1.
Peak Indicator Circuit Diagram :
R1 = 10K
R2 = 1.2K
R3 = 220K
R4 = 4.7K
R5 = 4.7K
C1 = 47uF-25V
C2 = 2.2uF-25V
Q1 = BC550C
Q2 = BC550C
D1 = Red LED
Notes:
- It can be assembled on a general purpose PCB.
- It can be powered from a 12V-15V regulated power supply.
Source : www.ecircuitslab.com/2011/05/simple-peak-indicator.html
Thursday, January 9, 2014
It is the place where cell phone jammers is necessary to be used
It is the place where cell phone jammers is necessary to be used
SMS one is not more than 70 words, sent from the platform to the user to receive the fastest just ten seconds; MMS a maximum capacity of about 40K or so, they can be quantified 10 (version), a total of 3000 words plus four pictures. During the Olympics, a huge crowd working life limit, in the absence or the move, this time, the convenience of the mobile newspaper will get the highlights. The mobile newspaper reported almost the only way they always watch the game. Even those people in front of the TV or computer all day, accustomed to the phone reported as the main source of information. After all, they care so deeply about the time of the live matches through mobile newspaper. It will supply the power for cell phone jammers itself.
You can use the minimum cost of reading to grasp all the games dynamic. Some even reported as a daily spectator guide. As of 24 on August 12, more than 10 million through China Mobiles "Olympics phone" concerned about the Olympic Games process. According to the survey interview, informed students on the use of mobile phones reported during the Olympic Games through the Olympic Mobile News Olympic Alerts feel convenient fashion. Some students said that each month as long as put into the cost of a few newspapers will be able to browse the entire month of Olympic information reports, cost-effective and innovative. Advantages: "Olympics phone" to take the combination of MMS and SMS text messages to ensure the timeliness, MMS meet the depth reading. It means the open wire and concealed wire laid on the wall where the installation of cell phone jammers will be carried out.
Early as the MMS one a day, one day a text message. July 1, 2008, increased to one day two MMS, SMS day three. Distinct content characteristics and strong technical support, Olympic mobile newspaper rapid expansion. To the Beijing Olympic Games start the first week, ordered the Olympic mobile newspaper users exceeded 10 million. The phone reportedly has a high arrival rate and circulation rate. This Olympic Games, millions of users are informed of Liu Xiang out of the race through the Olympic mobile phone SMS messages. Mobile terminal message, can be understood in a way to remind mandatory reading. Users also need to periodically delete old short color information in the phone to save memory space. It is the strong electricity around antenna of cell phone jammers .This removal process itself can also increase the likelihood of the second reading.
Here continue read..
SMS one is not more than 70 words, sent from the platform to the user to receive the fastest just ten seconds; MMS a maximum capacity of about 40K or so, they can be quantified 10 (version), a total of 3000 words plus four pictures. During the Olympics, a huge crowd working life limit, in the absence or the move, this time, the convenience of the mobile newspaper will get the highlights. The mobile newspaper reported almost the only way they always watch the game. Even those people in front of the TV or computer all day, accustomed to the phone reported as the main source of information. After all, they care so deeply about the time of the live matches through mobile newspaper. It will supply the power for cell phone jammers itself.
You can use the minimum cost of reading to grasp all the games dynamic. Some even reported as a daily spectator guide. As of 24 on August 12, more than 10 million through China Mobiles "Olympics phone" concerned about the Olympic Games process. According to the survey interview, informed students on the use of mobile phones reported during the Olympic Games through the Olympic Mobile News Olympic Alerts feel convenient fashion. Some students said that each month as long as put into the cost of a few newspapers will be able to browse the entire month of Olympic information reports, cost-effective and innovative. Advantages: "Olympics phone" to take the combination of MMS and SMS text messages to ensure the timeliness, MMS meet the depth reading. It means the open wire and concealed wire laid on the wall where the installation of cell phone jammers will be carried out.
Early as the MMS one a day, one day a text message. July 1, 2008, increased to one day two MMS, SMS day three. Distinct content characteristics and strong technical support, Olympic mobile newspaper rapid expansion. To the Beijing Olympic Games start the first week, ordered the Olympic mobile newspaper users exceeded 10 million. The phone reportedly has a high arrival rate and circulation rate. This Olympic Games, millions of users are informed of Liu Xiang out of the race through the Olympic mobile phone SMS messages. Mobile terminal message, can be understood in a way to remind mandatory reading. Users also need to periodically delete old short color information in the phone to save memory space. It is the strong electricity around antenna of cell phone jammers .This removal process itself can also increase the likelihood of the second reading.
Variable High Pass 20HZ to 200HZ Filter
A simple circuit, High-Pass filter, variable between frequencies 20HZ until 200HZ, useful in a lot of cases elaboration of sound signals. The regulation is achieved with the double potentiometer 47KΩ and the frequency response in his two extreme places, appears in the schematic.
Here continue read..
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| Variable High-Pass 20HZ to 200HZ Filter Circuit Diagram |
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